From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B27FF47143A; Tue, 25 Aug 2026 13:44:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787665464; cv=none; b=jnMHoQSBZey85GCps67+IATHNydbaHYNpd3eNhJkNlOy8ccytC3DYB0DzJUddAVjqjdH6fNwx6ksEXtrir1P8pd1bwF/kZ6ckTACXSyFkc5eMGqIbzBYqWg8dcVWZNpn7smkiInpMNhWh9xqP6/rgVz0dYp9lugOyKrgV3BjfeQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787665464; c=relaxed/simple; bh=hKXS/VynehjzLhpRpCRUzgRUsUbJVy7Jn0MqWakhJeY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=azHG+jaHbOY3I7Rx+H78y7HuSYmdpZvpzVJHkgBXyvCHSa06beJcp3ethQheU/LygKjc7AxCrs7z3CeGQiunAN8+mqvZR5GbAV2Ij8DeDSM/mNuGtS3eSJEBo6C2o+BQ4kCo629ynI94A4LLlmMzTzahPip0jNpeKB6/OtwOSF4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rfLdEh4K; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rfLdEh4K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 154901F00A3A; Tue, 25 Aug 2026 13:44:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787665463; bh=Iz0vQtoQyOClMKd5i6SkGRhJD8tTn3I+2dwgNI7i9QQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rfLdEh4KAG3uv7p2NUsiBCpLLkd6BYBRK5ZzOadRrmlwCcLCWkAAgBsH5U1aGOK1O gkdIZ30CnJj2kpvTY6iVj6MkP8exJgDs/F2djYyLK9lqtmYI6b+/pzoz6bZbQXBPGV sJs1znIATPurG0W0uMZRaXBusjXsxgwHCqBoFuNU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Doruk Tan Ozturk , Alexander Lobakin , David Heidelberg Subject: [PATCH 6.12 34/77] nfc: digital: clamp SENSF_RES length to the destination buffer Date: Tue, 25 Aug 2026 15:25:56 +0200 Message-ID: <20260825132542.897007602@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260825132541.580275153@linuxfoundation.org> References: <20260825132541.580275153@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Doruk Tan Ozturk commit 344a56d7c8e0f3cbaff0bcb1bcd95a1a1db24b16 upstream. digital_in_recv_sensf_res() memcpy()s resp->len bytes from a remote NFC-F device response into the NFC_SENSF_RES_MAXSIZE-byte target.sensf_res field without an upper-bound check. A nearby malicious NFC-F device can send an oversized SENSF_RES response to overflow the stack-local struct nfc_target. Clamp resp->len to NFC_SENSF_RES_MAXSIZE before the copy. Found by 0sec automated security-research tooling (https://0sec.ai). Fixes: 8c0695e4998d ("NFC Digital: Add NFC-F technology support") Cc: stable@vger.kernel.org Signed-off-by: Doruk Tan Ozturk Reviewed-by: Alexander Lobakin Link: https://patch.msgid.link/20260603141355.68156-1-doruk@0sec.ai Signed-off-by: David Heidelberg Signed-off-by: Greg Kroah-Hartman --- net/nfc/digital_technology.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/nfc/digital_technology.c +++ b/net/nfc/digital_technology.c @@ -778,6 +778,8 @@ static void digital_in_recv_sensf_res(st sensf_res = (struct digital_sensf_res *)resp->data; + resp->len = min_t(unsigned int, resp->len, NFC_SENSF_RES_MAXSIZE); + memcpy(target.sensf_res, sensf_res, resp->len); target.sensf_res_len = resp->len;